Uncoupling device for a timepiece mechanism and a watch movement comprising the same
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United States of America Patent
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Aug 13, 2013
Grant Date -
Sep 9, 2010
app pub date -
Mar 2, 2010
filing date -
Mar 3, 2009
priority date (Note) -
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Abstract
A vertical type uncoupling device, in particular in an automatic watch winding mechanism that includes an oscillating mass and a gear train connecting the oscillating mass to a barrel (9), wherein a gear train includes a direction reverser device (11, 12), a reduction gear (13, 14, 15, 16) and the uncoupling device (20). The uncoupling device includes two coaxial wheels (17, 7) that can be coupled in rotation in one direction owing to respective Breguet toothings (21, 22) arranged on the opposite flanks of the wheels. The coaxial wheel (17), which is mobile in the axial direction, is secured to a sliding arbour (18), which is mounted so as to rotate and slide in fixed bearings (24, 25). A return spring (26) includes an elastic strip that abuts against one end of the sliding arbour (18) to tend to engage and keep meshed the Breguet toothings. This design reduces friction and saves space. Other applications of this type of uncoupling device in a watch movement are described.
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